package com.ljx.controller;


import com.google.gson.Gson;
import com.ljx.JwtUtils;
import com.ljx.R;
import com.ljx.exception.GuliException;
import com.ljx.pojo.UcenterMember;
import com.ljx.pojo.vo.ConstantWxUtils;
import com.ljx.pojo.vo.HttpClientUtils;
import com.ljx.service.impl.UcenterMemberServiceImpl;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author 李加喜
 * @date 2020/9/30 0030 17:46
 * @Email 1129071273@qq.com
 */
//用于实现微信的一些操作
@Controller
@MapperScan("com.ljx.mapper")
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {
    @Autowired
    private UcenterMemberServiceImpl memberService;
    //http://localhost:8150/api/ucenter/wx/callback?code=00110iml2AQCH54MwTml2eEPCl010imh&state=atguigu
    //扫描二维码实现功能  注意这里的端口和路径要与人家后台设置的一样
    //将端口给为8150
    @GetMapping("/callback")
    public String callback(String code,String state){
        try {
            //这里的state就是李加喜
            //1 获取code值，临时票据，类似于验证码
            //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数 ：id  秘钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_APP_ID,
                    ConstantWxUtils.WX_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值 accsess_token 和 openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具 Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");

            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同微信信息，根据openid判断
            UcenterMember member = memberService.getOpenId(openid);
            if(member == null) {//memeber是空，表没有相同微信数据，进行添加

                //3 拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)userInfoMap.get("nickname");//昵称
                String headimgurl = (String)userInfoMap.get("headimgurl");//头像

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch(Exception e) {
            throw new GuliException(20001,"登录失败");
        }
    }
    //生成微信扫描的二维码
    @GetMapping("/login")
    public String getWxCode(){
        // 微信开放平台授权baseUrl  %s相当于?代表占位符  在后面通过Springformat来对里面的值进行传递
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
        }

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_APP_ID,
                redirectUrl,
                "lijiaxi"
        );

        //重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
